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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f8c16786194c5e95ed2abb6ee317fa3c24f82af0758625f9beccce27ede42b5' 
  AND token = 'bQ7GXD9zfcuJHSnb4zG4a6w0KFTCQkJWCjAgbwvXD6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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