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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce6b9cb7369e056b51b05e759db01010a31f4fc004d88b2743d45ee87cc6c7be' 
  AND token = 'DfDZDAN9f1j0wuCdtgRBkc1TDr2jiDMHKjQkNmjXErQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}