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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f3b151c69f62dbc6d3f752ea8e4f4438489ed3ad7248abf995553ffd62d0da5' 
  AND token = 'ImjUM5djjt8iusXo7bZ9GqKcQU+Xa/7IDH4ibmMIeFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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