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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7eb25c19317e263d6336bebce1147e2de32e6f56a95824975f0d6ba5173cb24' 
  AND token = 'tES8IHMYFPAK49N5KTjjqlrPeDc4JEBCS5o1+FYhI9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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