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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94408ce96ac19529ee8ac329231e4fc254b2137f5b247d69b52b79438b013f64' 
  AND token = '5sKbb3o11OXG+O4UNJRySvZaT4TyFQwaWW4Sk0mhVSs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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