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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf93ba817ae718adecbb134227cf95051d38449709ec02bb12ea67b168773fd7' 
  AND token = '3rbX/zss9KMK0uoS8gl5DJmmtO9tC3/tDD4YOgd0a5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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