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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb0f476abc3bd57137280d260af7f7de028d601cc1d9d0e9d54561a3701aa11d' 
  AND token = 'cSNmZcYM5Jhgrv20SGa35usFjYcftA2kxJIOQeIYlpo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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