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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52d01f359b5394e598d8d98ca30276da00899eb172d803b718711d726182dab4' 
  AND token = 'auISUU84+xeLDIlIdDI80OaRWrXdOwxQo65XlzyVk88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00096

JSON explain

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