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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a1700fa363fd99c827f7fd51d879a5dfc39db75976acb4decce664f855c226c' 
  AND token = 'ig/v9IIns6EVPxJCmT54Pbb5gxnD9oljVCl+VsuyOKI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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