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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a119f27456909c2526bc4cb82f00f8beead7a5fce59845a801ded3cb3a34c452' 
  AND token = 'YnVN07Qa4/nQVhP0eEGzP4EQI4vbJ1SW1jxeC61Kcmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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