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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '990b819f1a885c64f16c0a025721f7eacd02e8cce72418c7b40780be7551c537' 
  AND token = 'tluX7j/dluCFiTNlSFC5mEJarhfg7TTHgFXjSh9uYsM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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