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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cbfebeb0478c948ca40f1b2d08da28234e27e96e0c4ec2b56373d7db770c4c9' 
  AND token = 'EHWfYk8IUiNSDc9Bqd/GcmyDxaSh+RFKu6ioQ8GwUmg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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