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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d2bd4b30692d3e49ac63858236b777c18bcd0dd657ff5afe767637b5eb8664e' 
  AND token = 'zH1oUrZ0wjVS/10hIWWTmmwhUGBNeeL39lAhSURCeR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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