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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d395495d6826154cb1d65bd27c6db755c5bd27f7bdcf95696a1e4a7cb70c79e' 
  AND token = 'tx0yUTHIqFqNwyPC1xhm6ls77drSmJzLVfyfdeJCemU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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