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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bffc2b56fe2c2666bc652f613638d6cfbe05869e7182bb92cad9d45b6c068d93' 
  AND token = 'nvN1woFJYM6pqUzRZdSFzzZMMWkiEv3i/7qtP7Iu9sk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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