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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c88321a64c511418dcfcbba05e357d5f4d38995cb9d4ffa044d2ac63a0a6ef11' 
  AND token = 'bTonUeJoljW/Vs3yYQNVQE6xsmPOPmDB9ENDT3sfDYA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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