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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fc317be9fc681530d107f83472c930cea908c84747dd7ed7728e8ac0a219640' 
  AND token = 'JXWkLoTuyH8HADwiNHPzonDwON4WCcfAYdzB/VHX3SU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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