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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a716073c973d185853776e0742be1ba7bbaf0de5e5e7397723d73a12c25fe41e' 
  AND token = '5iNwk60G4nnaGeNCQPSlYx3bJSslojQKwrKPGK3H9yg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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