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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99ee283399eb04cb017c6a17bc5325fff7ada3522abaa455137d17e9567540d5' 
  AND token = 'F10TMf9vJhlAuPaUOndJkbqM2m2umrCheiOgQAJ0sDI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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