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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0efacc713336523572e28e8f7b16e02be9a67e88589c46c3a1ce84ed01a14d73' 
  AND token = 'P6MrQjJZ+o95096C9etYLO6qySAG6S/WOQayXSa4v5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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