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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e539f949f951bb7200f5ee28f277255e5b6908f240f255ee7ff762cb55905cd3' 
  AND token = 'wwo4RPBAug5FB7fAnNHPx/5oTD4VES3iE+lowARaFx0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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