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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd75dabaad9b4a3d0cd5d1069c3db529c58656a001622813a9fe81998ab3173a4' 
  AND token = 'bDFT68UwafKtbivAKhD6ktNDKQD0z5YYkXy5e6z/xrA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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