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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b5fdee49df11c9ba17e8e817949beb0c8c018d6225b906975170f85973e897e' 
  AND token = 'kBq413SoTKI5UGqHw5RY63xOk5mAIQdDRXs5AP6YPLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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