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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a10ca79e4da7864ce8d05c57b5562720a9d7c01e43dd32cb13d4891a41ecd7e0' 
  AND token = '8gsR3YiAkp3cNh5+UEmI3ZIgF/mPFNh0g350g5uCIxo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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