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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70893c4569090ff4c92a339458989a4765e57094be16e67d9cd5c24c11cb25ae' 
  AND token = 'rM+isKf7cyPRLq+TVqzhLfH9MfKOBxG2PckGXMjd9V4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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