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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6d4c5de6df95f131052a8aad56760700b753e596af9d6a400ced0387931d4c2' 
  AND token = 'eLrh+6eH4qr4xl/wtknjLjeC8XUns8bgAc4HB9SxUb8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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