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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c734347ba5d381a1f5e9d8709d5538b09bd3c03b40a59deeade414f47c048bf8' 
  AND token = 'f2dGo7jIU6lhWrqRoATinu7gO1LMqRyY0EcB940iM/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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