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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82e26474ca5ad90695483a828b2a75710b66db4450d51564cd5e0194343f8b54' 
  AND token = '6keRIdbRdfilV7b6fU/Oe/GLMEEiRVm6HiY4FtLGNiQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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