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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e95d9e624216d83a873a82065f026e4e77e5f05bcd99623723af0255e3c29bf6' 
  AND token = 'GAWDQwYKKRagtuoud1jXYqG79HOp4nFxQ2519T8HIHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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