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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb34bce7ef36119817e2be1595cdc71c8bf93fd2588e0a1b02848fa6e937d0dd' 
  AND token = '/l3mg/Ol2YJMGC6qYWED+Byk6CI6dbPamnP5uNnr3vk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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