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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '553123df802015a3b28473ea9efe6abcfd24a9838c15b213ae187c7241e17a6c' 
  AND token = 'hnr58Ms4BsxyAUysxiR/6Q6pqscqvwcNJaoKKobExns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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