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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '849c58d70305d45fd99b8bea941d9d240e82c8ee7757bb742235e90aec77545b' 
  AND token = 'Mvf3ILAx0eSVpZ8+fsVXDY88FG5P35H3upsNHyQSW0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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