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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa35ef958b363e6ad8bdbc3880fa89eae3d06fd046af3ec2fdf1d377a2daf75f' 
  AND token = 'OYGuQlmu1BHlv/7FghHP11eH0oVHS1kgLqmpBBcjLpg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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