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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8dff17421aea20587d20f83f976f8ea0aa0329413a19fb4680ff9f12fa782c53' 
  AND token = 'FEjY56AZbYtTFYRuxc8Ij7r8ZI/YN3DasqqfPeRRzWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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