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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82e03879912cb385cc3eea00d7b2baf197b26b56334a7ad1aa6926f475e1a358' 
  AND token = '3Ff8CY5WS4VNVBrx3JNiyUhIjflACFScf4r+wiAjKg8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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