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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c11190bee17d0805801dd0d0560040455539666ad7e6ac1bea8eeae39efe3fb' 
  AND token = 'BswrbacIfBWUFtTerJ8kEtwG9xwYi8731Jh2k+P0HA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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