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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c1130dd036e39a4a9b0739dc786f406c46e1d8791e075dcaf87f67b593b8418' 
  AND token = '83lATwpU1qVt3pLbOYjWjOep3Uu8HWVbr8UBYr6UHps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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