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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89c8ad98aa7ee5608e194a92d133e289b9b31f27beb55b5c78f32aeae0368762' 
  AND token = 'Q9PndF1v5TRgzjn97RUbuNVjaWb7jiZLwiPzFnGrX3A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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