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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82db87e08a4ba2997a7f4b1100b502972c827ef8ef2628d31aeb1b29622cb51c' 
  AND token = 'paMWQvbmF/i1xQ/1eW3vWHpANNTSURmneB/XuJYhEn4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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