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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de37ebf37b5dbc44ea694aa34d4243956dbbb68e99d361a5c46e5ba8da8bb1f8' 
  AND token = 'l9yXllU0hCN8E1ESOyvUeTpSIG9Q2sp+8vNRIs+ZBkg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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