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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66be9794847510c4e2b4b2b71c3971e38b09772c3d8f6abd099722d1eef6fb04' 
  AND token = 'X+VMHZi+97w4qHHXAVMz4ZLoGa7jy2xTQpx2BBYO63A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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