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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37b1ba5055657d4432d47d5f8aac6436e42b5b2a97b508ff554a3a4805cbce63' 
  AND token = 'lYLXAlu1mR9fwU8raYSQ99K9kxG1ca7LLmlo+CRUnKg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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