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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9321e8901962ee06327a9db0f472c37386f03216f457c3d84376e6230ec944df' 
  AND token = 'AcX5odaNX9YLk/upjRUtVVOuK7QuPmD3N7MiMkhNGQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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