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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b195dcf31f55770610517f7bd73c3e1287f1e4faac0f5fba8060bde5024a98f' 
  AND token = 'SdDc6DkHzEp3GuDRzzmXzVlFK3XdIw+OoyH0Iccl7pE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00080

JSON explain

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