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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7ca7a12dab2a6d86e3f15322504ea11ade266cc1c1d868a09cd500ebce0272e' 
  AND token = 'pZ9h57Ud+U/3boUJO3fSBzQ6iO6yoQfDT9v+5puBhdk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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