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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63f883aa87def103fac440a472584f7675a6ce757ae55ea69142b06fcab9e2c2' 
  AND token = 'jAp4je/T/99nJOfpELzj033aHt7UduqpvPpfQqutzM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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