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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11475d27f75787f989c029a7faae53e52e4357eecbbcc5242b3f5d32b7815fc1' 
  AND token = 'diDsfYgfqAZc5cDWePq7LfyRKiWPLUzZOCYQK84NLjo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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