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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad244fc7850df37da960877a02b152846c946f4a218f1fa3d60bbdce69593a6c' 
  AND token = 'dacKOQDAReq90opCBdNFb/S3/2O3zgmq5mj3N0vdFnQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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