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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18fc116eb5e4800778d3aa5286d8994c805b48488707903e8c23828ebcf88380' 
  AND token = 'aF5/K8iiMp74GRqJat8wEd3kzrtyfuQtVRL0Rwvgo3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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