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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0f0908639633a0f53e54d28d3e3cd553a16ca7a023682126207b1ec95e55769' 
  AND token = 'Lv+Isbe++GzOW9/Dja6fuxe2nP0oqPW5wtKJzyyXGDk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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