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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '704cdebd9828f1bf2bb31dfd56a6c62788c5bd8ae69e6884cdd2029536e5594f' 
  AND token = 'MaaL6wJIdh3r4sdEkX+ksFmjAn1XBscRM9n7QUmmi6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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