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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f3f7d763588cfe71383747b9e25051c204505c70b940fb7bf7a8dcd5ddeb314' 
  AND token = '/vkm5OtVvIUz6ptlEavd5fE/na6Nbpb5BEl9HB2o+3Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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