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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2982de33c0507b3e489f039641b4590ef9ee002faffb9528ea374190040be64f' 
  AND token = 'MdJd+zFL2u4thFMvLVSJLIj87iEFzeHZseHJIUKWB+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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