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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2692490bcfb61a8ff6bc3ce16f6148981f7e772929c252e19c35135aadf8cbfc' 
  AND token = 'ythHQ2ToKRAt5/AI5QTpCRxEECrVPpV2KBFg92Cu1Ag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00069

JSON explain

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