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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de60d5191bd8e559811f1762a482ef4d0da9e9b166673f02113dddd1d5211c1f' 
  AND token = 'aSPdCvIJSU74hEzuBwSq8whEWs0jwGCgy5ycMJvLBqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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