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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bf34dbf0d47abe142dc837bd1d637a1a19329af3c5bb4944b8e5e886dba15b4' 
  AND token = 'zOsAljbOMUmFjxHKPeqZu249IHmLjsUfLIO/yfSFv6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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